US3661886A
Expired / Lapsed
US
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Basic azo dyestuffs containing a heterocyclic quaternary ammonium group
Assignee: BASF Schweiz AG
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Filing: 1970-05-26
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Granted: 1972-05-09
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Expires: 1990-05-26
Abstract
Abstract BASIC DYESTUFFS WHICH ARE FREE FRO ACIDIC GROUPS IMPARTING SOLUBILITY IN WATER AND WHICH CORRESPOND TO THE FORMULA 1,4-DI(V-),2-Q;5-(B-N=N-)BENZENE OR 1,2-DI(V-),4-Q,5-(B-N=N-)BENZENE WHEREIN Q IS AN ELECTRONEGATIVE GROUP, R IS A COUPLING COMPONENT, ONE OF V IS HYDROGEN, ALKYL, CHLORINE OR BROMINE AND THE OTHER A -O- ALKYLENEAMINO MOIETY. THE COMPOUNDS ARE PREPARED BY COUPLING, CONDENSATION WITH AN AMINE OR HYDRAZINE OR BY ALKYLATION. THEY ARE USEFUL FOR DYEING SYNTHETIC FIBERS, YIELDING STRONG AND LEVEL DYEINGS OF GOOD GENERAL FASTNESS, ESPECIALLY FASTNESS TO WET TREATMENTS, LIGHT AND RUBBING.
Inventors
- 👤 Gert Heger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:57
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |